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United States Patent | 5,040,883 |
Cobb, Jr. | August 20, 1991 |
A light extraction film has light extraction structures on one surface and a Fresnel lens for beam shaping on the opposite surface.
Inventors: | Cobb, Jr.; Sanford (St. Mary's Point, MN) |
Assignee: | Minnesota Mining and Manufacturing Company (Saint Paul, MN) |
Appl. No.: | 429163 |
Filed: | October 30, 1989 |
Current U.S. Class: | 359/742; 359/831 |
Intern'l Class: | G02B 003/08; G02B 005/04 |
Field of Search: | 350/452,276 SL,96.13,167,286,431,96.28 362/331,33 |
4385808 | May., 1983 | Vanderwerf | 350/452. |
Foreign Patent Documents | |||
0054902 | Apr., 1982 | JP | 350/452. |